I haven't seen anything out here about this and I thought I'd mention it for a future tweak.
I'm running Object Dock Plus on dual monitors in extended mode. If I set an untabbed dock to autohide on the right edge of the left display or the left edge of the right display (i.e., on the edge of either monitor that leads into the other monitor), the dock autohides itself by moving over onto the other display's "connecting" edge in a visible but inactive state. Then when I mouseover on it on the appropriate monitor it slides back over and becomes active as it should, then slides back to the other monitor when it becomes inactive again.
This only occurs with the untabbed docks, the tabbed docks behave as they should. I'm running an ATI 9600xt with their Catalyst software, no other 3rd party monitor management software.
It seems like it was just a programming oversight, or am I missing something? Thanks.